Agreed. The Facebook group seems better suited to beginners as you say - where they can get immediate answers but don't need to access stuff from ages ago. Mind you, there's always the 'Search within Group' feature to find older stuff - though it has to be a Group not a Page (what's the difference? who knows. who cares...)
In this particular case, I think the cleaning is definitely the right thing to do. The uncleaned coin has very poor visual appeal. Although the cleaned coin is not lustrous, it is at least much easier on the eye.